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819 Striker Avenue Suite 8 <br /> Sequoia Sacramento CA 95834 <br /> 9600 <br /> (916)921 9600 <br /> FAX(916)92 1-0 100 <br /> Analytical www secluoialabs corn <br /> Stratus Environmental Project ARCO 2168,Stockton,CA <br /> 3330 Cameron Park Drive,Ste 550 ProjectNutnber 2168,Stockton,CA Reported <br /> Cameron Park CA,95682 Project Manager Jay Johnson 08/24/02 14 SO <br /> Volatile Organic Compounds by EPA Method 8260E - Quality Control <br /> Sequoia Analytical - Sacramento <br /> Reporting Spike Source %REC RPO <br /> Analyte Result Limit Units Level Result %REC limits RPD Limit Notes <br /> Batch 2080234-EPA 5030B [PIT] <br /> Blank(2080234-BLK1) Prepared&Analyzed 08/23/02 <br /> Tert-butyl alcohol ND 50 ugA <br /> Methyl tent-butyl ether ND 050 " <br /> Di-isopropyl ether ND 050 " <br /> Ethyl tert-butyl ether ND 0 50 " <br /> Tert-amyl methyl ether ND 050 " <br /> Ethanol ND 50 <br /> 1,2-Dichloroethane ND 050 " <br /> Surrogate 12-DCA-d4 246 230 98 60-140 <br /> LCS(2080234-BS1) Prepared&Analyzed 08/23/02 <br /> Methyl tert-butyl ether 235 050 ug/l 21 8 108 60-140 <br /> gate 12-DCA-d4 232 11250 93 60-140 <br /> Matrix Spike(2080234-MSI) Source S208287-03 Prepared&Analyzed 08/23/02 <br /> Methyl tert-butyl ether 238 050 ugfl 218 ND 109 60-140 <br /> Surrogate 12-DCA-d4 239 250 96 60-140 <br /> Matrix Spike Dup(2080234-MSD1) Source 5208287-03 Prepared&Analyzed 08/23/02 <br /> Methyl tert-butyl ether 248 050 ug/l 218 ND 114 60-140 4 25 <br /> Surrogate 11-DCA-d4 232 250 93 60-140 <br /> nota Analytical-Sacramento The results in this report apply to the samples analyzed in accordance with the chain of <br /> custody document This analytical report must be reproduced in its entirety <br /> Page 7 of 8 <br />